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Description
Material HSS
Thread size M1.2
ChamferB (3.5–5.5) threads
Standard DIN 371
Technical data for the M1.2 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M1.2 |
| Thread Pitch P | 0.25 mm |
| Overall Length l1 | 40 mm |
| Flute Length l2 | 5.5 mm |
| Length l3 | 13 mm |
| Shank Diameter d2 | 2.5 mm |
| Square Drive Size a | 2.1 mm |
| Tap Drill Diameter | 0.95 mm |
| Chamfer | B (3.5÷5.5) P |
| Thread tolerance | 6H |
How the type B through-hole chamfer pushes chips down the hole
Chips exit at the bottom instead of returning through the thread
The form B through-hole chamfer has a chip breaker at the front of the tap – an angled cut in the cutting edges. The chip breaker directs chips down the hole, ahead of the tap tip. The chip curls into a coil, breaks into short pieces, and exits the hole on the other side of the workpiece. Threads already cut remain clean because chips do not pass through them on their way up. The M1.2 x0.25 tap has a reinforced shank in accordance with DIN 371: diameter 2.5 mm, square 2.1 mm.
1
Straight flute – chips do not enter it; the flute carries lubricant to the cutting edges.
2
The chip breaker at the tip of the tap directs chips down the hole.
3
The tap rotates clockwise to cut a right-hand thread.
4
B chamfer: 3.5–5.5 incomplete threads on the entry taper.
5
The chips break into segments: individual pieces at the top of the hole, with progressively more farther down. They fall out below the workpiece.
6
Feed 0.25 mm/rev, equal to the pitch of the M1.2 x0.25 thread.
M1.2 machine tap for through holes – in accordance with DIN 371
The M1.2 machine tap for through holes is a professional tool for cutting precise internal threads with a diameter of 1.2 mm in through holes. The HSS high-speed steel construction with a hardness of 62-65 HRC ensures optimum cutting edge life when machining materials with a tensile strength of up to 800 MPa. The 6H tolerance in accordance with DIN 371 guarantees the dimensional repeatability essential in the production of precision components. The Werko M1.2 tap is intended for toolrooms, electronic component manufacturers, and workshops specializing in precision engineering and prototyping.
Key benefits of the M1.2 machine tap for through holes
- Durability and wear resistance thanks to HSS high-speed steel with a hardness of 62-65 HRC, which retains its cutting properties through hundreds of tapping cycles in soft and medium-hard materials
- Tolerance class 6H precision in accordance with DIN 371, ideal for assembling miniature fasteners in electronics, optics, and precision engineering
- Compliance with DIN 371 confirms manufacturing quality and ensures standardized short shank dimensions for small-diameter machine tool holders
- Material versatility covering structural steels up to 800 MPa, aluminum, brass, bronze, and engineering plastics used in electronics
- Compatibility with precision toolholders of types ER8 and ER11, and collets for micromachining on precision milling centers and automatic lathes
- Metric pitch of 0.25 mm in accordance with DIN 13 for M1.2 coarse threads, the recommended tap drill diameter is 0.95 mm for a full thread profile
The M1.2 machine tap for through holes is used in toolrooms and prototyping shops to manufacture miniature mechanical components. Form B with straight flutes directs chips forward when tapping through holes. Compatible with ER8/ER11 precision collet chucks and automatic tool change systems on CNC machining centers.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 1326-5305 | 332-1326 |
| MStainless steel | 5-10 | 1326-2653 | 332-663 |
| KCast iron | 5-15 | 1326-3979 | 332-995 |
| NAluminum | 10-25 | 2653-6631 | 663-1658 |
Thread preparation M1.2 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 0.95 mm
3 Tapping
M1.2
✓ Done!
Tolerance 6H
Standard: DIN 371 | Chamfer: B (straight) | Application: through holes
Tolerance 6H — metric thread tolerance classes
| Class | Accuracy | Application | Status |
|---|---|---|---|
| 4H / 4g | High | Precision connections, hydraulics | — |
| 6H / 6g | Standard | Machine building, general-purpose | SELECTED |
| 7H / 8g | Low | Large clearance, easy assembly | — |
6H = internal thread (nut, hole) | 6g = external thread (screw)
Frequently asked questions
The M1.2 HSS tap performs well in structural steels up to 800 MPa, aluminum, brass, bronze, and engineering plastics. HSS steel provides optimum tool life when machining soft and medium-hard materials used in electronics and precision engineering.
The recommended tap drill diameter for the M1.2 thread is 0.95 mm. Accurate hole preparation is critical for such small diameters — a deviation greater than 0.02 mm can result in an incomplete thread profile or tap damage.
An HSS tap has a hardness of 62-65 HRC and withstands temperatures up to 550-600°C. HSSE with 5% cobalt reaches 65-67 HRC and operates at up to 650°C. For M1.2 in standard materials, HSS is sufficient and economically justified.
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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